import dataclasses
import json
import re

from flask import Flask, jsonify, request, Response, stream_with_context
from flask_cors import CORS, cross_origin

from stampy_chat import logging
from stampy_chat.env import PINECONE_INDEX, FLASK_PORT
from stampy_chat.settings import Settings
from stampy_chat.chat import run_query
from stampy_chat.callbacks import stream_callback
from stampy_chat.citations import get_top_k_blocks
from stampy_chat.db.session import make_session
from stampy_chat.db.models import Rating


# ---------------------------------- web setup ---------------------------------

app = Flask(__name__)
cors = CORS(app)
app.config['CORS_HEADERS'] = 'Content-Type'

# ---------------------------------- sse stuff ---------------------------------

def stream(src):
    yield from ('data: ' + '\ndata: '.join(message.splitlines()) + '\n\n' for message in src)
    yield 'event: close\n\n'

# ------------------------------- semantic search ------------------------------


@app.route('/semantic', methods=['POST'])
@cross_origin()
def semantic():

    query = request.json['query']
    k = request.json.get('k', 20)
    return jsonify(get_top_k_blocks(query, k))



# ------------------------------------ chat ------------------------------------


@app.route('/chat', methods=['POST'])
@cross_origin()
def chat():
    query = request.json.get('query', None)
    session_id = request.json.get('sessionId')
    history = request.json.get('history', [])
    settings = request.json.get('settings', {})

    if query is None:
        query = history[-1].get('content')
        history = history[:-1]

    def formatter(item):
        if isinstance(item, Exception):
            item = {'state': 'error', 'error': str(item)}
        return json.dumps(item)

    def run(callback):
        return run_query(session_id, query, history, Settings(**settings), callback)

    return Response(stream_with_context(stream(stream_callback(run, formatter))), mimetype='text/event-stream')


# ------------- simplified non-streaming chat for internal testing -------------

@app.route('/chat/<path:param>', methods=['GET'])
@cross_origin()
def chat_simplified(param=''):
    res = run_query(None, param, [], Settings())
    res = jsonify({k: v for k, v in res.items() if k in ['text', 'followups']})
    return Response(res, mimetype='application/json')

# ---------------------- human authored content retrieval ----------------------

# act as a proxy, forwarding any requests to /human/<id> to
# https://aisafety.info/questions/<id> in order to get around CORS
@app.route('/human/<id>', methods=['GET'])
@cross_origin()
def human(id):
    import requests
    r = requests.get(f"https://aisafety.info/questions/{id}")
    logging.info(f"clicked followup '{json.loads(r.text)['data']['title']}': https://stampy.ai/?state={id}")

    # run a regex to replace all relative links with absolute links. Just doing
    # a regex for now since we really don't need to parse everything out then
    # re-serialize it for something this simple.
    # <a href=\"/?state=6207&question=What%20is%20%22superintelligence%22%3F\">
    #                               ⬇️
    # <a href=\"https://stampy.ai/?state=6207&question=What%20is%20%22superintelligence%22%3F\">
    text = re.sub(r'<a href=\\"/\?state=(\d+.*)\\">', r'<a href=\"https://aisafety.info/?state=\1\\">', r.text)

    return Response(text, mimetype='application/json')

# ------------------------------------------------------------------------------

@app.route('/ratings', methods=['POST'])
@cross_origin()
def ratings():
    session_id = request.json.get('sessionId')
    settings = request.json.get('settings', {})
    score = request.json.get('score')

    if not session_id or score is None:
        return Response('{"error": "missing params}', 400, mimetype='application/json')

    with make_session() as s:
        s.add(Rating(session_id=session_id, score=score, settings=json.dumps(settings)))
        s.commit()

    return jsonify({'status': 'ok'})



if __name__ == '__main__':
    app.run(debug=True, port=FLASK_PORT)